// 屏幕宽度
@vw: ~"calc(100vw - (100vw - 100%))";
@vh: 100vh;
// 动画时长 (ms) ( config/index.js )
@animationDurations: 400ms;
@animationDurationsHalf: 400/2ms;
// 动画曲线 ( config/index.js )
@animationFunction: cubic-bezier(0.15, 1, 0.3, 1);

.backgroundLayer {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  cursor: zoom-out;
  transition: all @animationDurations;
  background-color: rgba(0, 0, 0, 0);
  opacity: .5;
}